Filter-strainer.



No. 690,54l. Patented Jan. 7, I902.

W. WAGNER.

FILTER STBAINER. (Application filed. May 24, 1901.)

(No Mod el.)

THE mamas mans cu. mofaumq. wnsnmo'mu. a. c.

UNITED STATES PATENT OFFICE.

WALTER WAGNER, OF BERWYN, ILLINOIS.

FILTER-STRAINER.

SPECIFICATION forming part of Letters Patent No. 690,541, dated January 7, 1902.

Application filed May 24, 1901.

To all whom it may concern.-

Be it known that I, WALTER WAGNER, a citizen of the United States, residing at Berwyn, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Filter Strainers, which are fully set forth in the following specification, reference being had to theaccompanying drawings, forming a part hereof, and in which-=- Figure 1 shows my said new filter-strainer in side elevation attached to the bottom of a fragment of a filter-basin. Fig. 2 shows a transverse section of Fig. 1 on the cuttingplane was. Fig. 3 shows a screen-holder in elevation. Fig. t shows a screen in elevation.

Like reference-letters denote like parts.

The object of my invention is to produce a strainer for reversible-current filters which shall be simpler and cheaper of construction than those nowin use and wherein the screens shall not be subjected to the weight of the filtering-sand above them nor to the direct action of the reversed cur-rent when washin g the fllter bed.

To attain said desirable end, I construct my. said strainer in substantially the following manner, namely: I make a cast rectangular body A, having the exterior outline a and the interior outline a, which is parallel with said exterior outline except at the corners,wherein there is a quarter-round fillet to give sufficient material for the rivet holes e. The bottom of the body A is provided with a screwthreaded tubular stem g, by means of which it is attached to the filter-bottom f and through which the water'flows in or out, according to the direction given toit. Both edges or end faces of the frame A are parallel to each other and smooth to receive and make a close joint with the screens b, which are provided with serial in. 61,788. (No model.)

rivet-holes near their corners, as shown, and upon each of which said screens is laid a guard or screen-holder. 0, having an opening 72., whereof the circumference extends to or slightly beyond the edge or line a of the frame A.

In my said construction the cast case A carries the sand above it and when the reversed or washing current flows from the stem g into A the sand such current carries impinges against the inner face of the frame A and not on the screen, and thereby saves the screen from the wear and injury which it is subjected to where the said washing-current flows with more or less direct action against the screen, which thereby suffers quick wear, especially so when much sand is accidentally in the flowing water.

What I claim is- 1. The combination with a reversible-cur? .rent gravity filter bed, of ahollow stemmed screen-holder provided with screens on its ends, said screens being vertical to the plane of said bed, substantially as specified.

,2. A filterstrainer consisting of a case with parallel screen ends and a screw-stem to said case axially parallel with the screens,

guards to said screens, and means for fas tening said parts together, substantially as specified.

3. A filter-strainer consisting of a frame having parallel screen ends, a stem between said ends with axis parallel thereto, screens, and screen-guards provided with dischargeopenings, rivet-openings to said guards and screens, and rivets to unite said parts, sub= stantially as specified. I

WALTER WAGNER.

Witnesses WM. ZIMMERMAN, JOHN S. HARGER. 

